French wine consumed by Norwegian composer in mourning (8)
I believe the answer is:
grieving
'mourning' is the definition.
('grieving' can be a synonym of 'mourning')
'french wine consumed by norwegian composer' is the wordplay.
'french wine' becomes 'vin' (I've seen this before).
'consumed by' means one lot of letters goes inside another.
'norwegian composer' becomes 'grieg' (Norwegian composer Edvard Grieg 1843-1907).
'vin' placed within 'grieg' is 'GRIEVING'.
'in' is the link.
(Other definitions for grieving that I've seen before include "Mourning" , "Lamenting a personal loss" .)